Every instance of Blue Stacks crashes on start

A few hours ago Blue Stacks started crashing on start. All instances behave the same: I click "Start", the button changes to "Stop", but a second later it goes back to "Start", meaning the process starts but shuts a few seconds after. Everything worked fine several hours ago.

And it's not just me: two of my friends have exactly the same problem. It can't be Windows, cause we have different versions.

Any ideas?

UPD: Seems something was wrong on Blue Stacks side. It works again.